Big jobs require big equipment. Enter Specialized's Purgatory GRID 2Bliss Tire. Its large-volume casing floats over rock gardens, roots and keeps you firmly in command. Monster traction in soft/loamy conditions comes in the form of squared, biting side knobs with wide, openly-spaced center knobs that also clean the muck as you roll through. Plus, the Purgatory utilizes Specialized's GRID and 2Bliss technologies that give you all the advantages of a tubeless system like lower pressures, reduced pinch flats and improved strengthened sidewalls without added heft.